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/* File format for coverage information Copyright (C) 1996, 1997, 1998, 2000, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. Contributed by Bob Manson <manson@cygnus.com>. Completely remangled by Nathan Sidwell <nathan@codesourcery.com>. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING. If not, write to the Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* As a special exception, if you link this library with other files, some of which are compiled with GCC, to produce an executable, this library does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. */ /* Coverage information is held in two files. A notes file, which is generated by the compiler, and a data file, which is generated by the program under test. Both files use a similar structure. We do not attempt to make these files backwards compatible with previous versions, as you only need coverage information when developing a program. We do hold version information, so that mismatches can be detected, and we use a format that allows tools to skip information they do not understand or are not interested in. Numbers are recorded in the 32 bit unsigned binary form of the endianness of the machine generating the file. 64 bit numbers are stored as two 32 bit numbers, the low part first. Strings are padded with 1 to 4 NUL bytes, to bring the length up to a multiple of 4. The number of 4 bytes is stored, followed by the padded string. Zero length and NULL strings are simply stored as a length of zero (they have no trailing NUL or padding). int32: byte3 byte2 byte1 byte0 | byte0 byte1 byte2 byte3 int64: int32:low int32:high string: int32:0 | int32:length char* char:0 padding padding: | char:0 | char:0 char:0 | char:0 char:0 char:0 item: int32 | int64 | string The basic format of the files is file : int32:magic int32:version int32:stamp record* The magic ident is different for the notes and the data files. The magic ident is used to determine the endianness of the file, when reading. The version is the same for both files and is derived from gcc's version number. The stamp value is used to synchronize note and data files and to synchronize merging within a data file. It need not be an absolute time stamp, merely a ticker that increments fast enough and cycles slow enough to distinguish different compile/run/compile cycles. Although the ident and version are formally 32 bit numbers, they are derived from 4 character ASCII strings. The version number consists of the single character major version number, a two character minor version number (leading zero for versions less than 10), and a single character indicating the status of the release. That will be 'e' experimental, 'p' prerelease and 'r' for release. Because, by good fortune, these are in alphabetical order, string collating can be used to compare version strings. Be aware that the 'e' designation will (naturally) be unstable and might be incompatible with itself. For gcc 3.4 experimental, it would be '304e' (0x33303465). When the major version reaches 10, the letters A-Z will be used. Assuming minor increments releases every 6 months, we have to make a major increment every 50 years. Assuming major increments releases every 5 years, we're ok for the next 155 years -- good enough for me. A record has a tag, length and variable amount of data. record: header data header: int32:tag int32:length data: item* Records are not nested, but there is a record hierarchy. Tag numbers reflect this hierarchy. Tags are unique across note and data files. Some record types have a varying amount of data. The LENGTH is the number of 4bytes that follow and is usually used to determine how much data. The tag value is split into 4 8-bit fields, one for each of four possible levels. The most significant is allocated first. Unused levels are zero. Active levels are odd-valued, so that the LSB of the level is one. A sub-level incorporates the values of its superlevels. This formatting allows you to determine the tag hierarchy, without understanding the tags themselves, and is similar to the standard section numbering used in technical documents. Level values [1..3f] are used for common tags, values [41..9f] for the notes file and [a1..ff] for the data file. The basic block graph file contains the following records note: unit function-graph* unit: header int32:checksum string:source function-graph: announce_function basic_blocks {arcs | lines}* announce_function: header int32:ident int32:checksum string:name string:source int32:lineno basic_block: header int32:flags* arcs: header int32:block_no arc* arc: int32:dest_block int32:flags lines: header int32:block_no line* int32:0 string:NULL line: int32:line_no | int32:0 string:filename The BASIC_BLOCK record holds per-bb flags. The number of blocks can be inferred from its data length. There is one ARCS record per basic block. The number of arcs from a bb is implicit from the data length. It enumerates the destination bb and per-arc flags. There is one LINES record per basic block, it enumerates the source lines which belong to that basic block. Source file names are introduced by a line number of 0, following lines are from the new source file. The initial source file for the function is NULL, but the current source file should be remembered from one LINES record to the next. The end of a block is indicated by an empty filename - this does not reset the current source file. Note there is no ordering of the ARCS and LINES records: they may be in any order, interleaved in any manner. The current filename follows the order the LINES records are stored in the file, *not* the ordering of the blocks they are for. The data file contains the following records. data: {unit function-data* summary:object summary:program*}* unit: header int32:checksum function-data: announce_function arc_counts announce_function: header int32:ident int32:checksum arc_counts: header int64:count* summary: int32:checksum {count-summary}GCOV_COUNTERS count-summary: int32:num int32:runs int64:sum int64:max int64:sum_max The ANNOUNCE_FUNCTION record is the same as that in the note file, but without the source location. The ARC_COUNTS gives the counter values for those arcs that are instrumented. The SUMMARY records give information about the whole object file and about the whole program. The checksum is used for whole program summaries, and disambiguates different programs which include the same instrumented object file. There may be several program summaries, each with a unique checksum. The object summary's checksum is zero. Note that the data file might contain information from several runs concatenated, or the data might be merged. This file is included by both the compiler, gcov tools and the runtime support library libgcov. IN_LIBGCOV and IN_GCOV are used to distinguish which case is which. If IN_LIBGCOV is nonzero, libgcov is being built. If IN_GCOV is nonzero, the gcov tools are being built. Otherwise the compiler is being built. IN_GCOV may be positive or negative. If positive, we are compiling a tool that requires additional functions (see the code for knowledge of what those functions are). */ #ifndef GCC_GCOV_IO_H #define GCC_GCOV_IO_H #if IN_LIBGCOV /* About the target */ #if BITS_PER_UNIT == 8 typedef unsigned gcov_unsigned_t __attribute__ ((mode (SI))); typedef unsigned gcov_position_t __attribute__ ((mode (SI))); #if LONG_LONG_TYPE_SIZE > 32 typedef signed gcov_type __attribute__ ((mode (DI))); #else typedef signed gcov_type __attribute__ ((mode (SI))); #endif #else #if BITS_PER_UNIT == 16 typedef unsigned gcov_unsigned_t __attribute__ ((mode (HI))); typedef unsigned gcov_position_t __attribute__ ((mode (HI))); #if LONG_LONG_TYPE_SIZE > 32 typedef signed gcov_type __attribute__ ((mode (SI))); #else typedef signed gcov_type __attribute__ ((mode (HI))); #endif #else typedef unsigned gcov_unsigned_t __attribute__ ((mode (QI))); typedef unsigned gcov_position_t __attribute__ ((mode (QI))); #if LONG_LONG_TYPE_SIZE > 32 typedef signed gcov_type __attribute__ ((mode (HI))); #else typedef signed gcov_type __attribute__ ((mode (QI))); #endif #endif #endif #if defined (TARGET_POSIX_IO) #define GCOV_LOCKED 1 #else #define GCOV_LOCKED 0 #endif #else /* !IN_LIBGCOV */ /* About the host */ typedef unsigned gcov_unsigned_t; typedef unsigned gcov_position_t; /* gcov_type is typedef'd elsewhere for the compiler */ #if IN_GCOV #define GCOV_LINKAGE static typedef HOST_WIDEST_INT gcov_type; #if IN_GCOV > 0 #include <sys/types.h> #endif #else /*!IN_GCOV */ #define GCOV_TYPE_SIZE (LONG_LONG_TYPE_SIZE > 32 ? 64 : 32) #endif #if defined (HOST_HAS_F_SETLKW) #define GCOV_LOCKED 1 #else #define GCOV_LOCKED 0 #endif #endif /* !IN_LIBGCOV */ /* In gcov we want function linkage to be static. In the compiler we want it extern, so that they can be accessed from elsewhere. In libgcov we need these functions to be extern, so prefix them with __gcov. In libgcov they must also be hidden so that the instance in the executable is not also used in a DSO. */ #if IN_LIBGCOV #include "tconfig.h" #define gcov_var __gcov_var #define gcov_open __gcov_open #define gcov_close __gcov_close #define gcov_write_tag_length __gcov_write_tag_length #define gcov_position __gcov_position #define gcov_seek __gcov_seek #define gcov_rewrite __gcov_rewrite #define gcov_is_error __gcov_is_error #define gcov_write_unsigned __gcov_write_unsigned #define gcov_write_counter __gcov_write_counter #define gcov_write_summary __gcov_write_summary #define gcov_read_unsigned __gcov_read_unsigned #define gcov_read_counter __gcov_read_counter #define gcov_read_summary __gcov_read_summary /* Poison these, so they don't accidentally slip in. */ #pragma GCC poison gcov_write_string gcov_write_tag gcov_write_length #pragma GCC poison gcov_read_string gcov_sync gcov_time gcov_magic #ifdef HAVE_GAS_HIDDEN #define ATTRIBUTE_HIDDEN __attribute__ ((__visibility__ ("hidden"))) #else #define ATTRIBUTE_HIDDEN #endif #else #define ATTRIBUTE_HIDDEN #endif #ifndef GCOV_LINKAGE #define GCOV_LINKAGE extern #endif /* File suffixes. */ #define GCOV_DATA_SUFFIX ".gcda" #define GCOV_NOTE_SUFFIX ".gcno" /* File magic. Must not be palindromes. */ #define GCOV_DATA_MAGIC ((gcov_unsigned_t)0x67636461) /* "gcda" */ #define GCOV_NOTE_MAGIC ((gcov_unsigned_t)0x67636e6f) /* "gcno" */ /* gcov-iov.h is automatically generated by the makefile from version.c, it looks like #define GCOV_VERSION ((gcov_unsigned_t)0x89abcdef) */ #include "gcov-iov.h" /* Convert a magic or version number to a 4 character string. */ #define GCOV_UNSIGNED2STRING(ARRAY,VALUE) \ ((ARRAY)[0] = (char)((VALUE) >> 24), \ (ARRAY)[1] = (char)((VALUE) >> 16), \ (ARRAY)[2] = (char)((VALUE) >> 8), \ (ARRAY)[3] = (char)((VALUE) >> 0)) /* The record tags. Values [1..3f] are for tags which may be in either file. Values [41..9f] for those in the note file and [a1..ff] for the data file. The tag value zero is used as an explicit end of file marker -- it is not required to be present. */ #define GCOV_TAG_FUNCTION ((gcov_unsigned_t)0x01000000) #define GCOV_TAG_FUNCTION_LENGTH (2) #define GCOV_TAG_BLOCKS ((gcov_unsigned_t)0x01410000) #define GCOV_TAG_BLOCKS_LENGTH(NUM) (NUM) #define GCOV_TAG_BLOCKS_NUM(LENGTH) (LENGTH) #define GCOV_TAG_ARCS ((gcov_unsigned_t)0x01430000) #define GCOV_TAG_ARCS_LENGTH(NUM) (1 + (NUM) * 2) #define GCOV_TAG_ARCS_NUM(LENGTH) (((LENGTH) - 1) / 2) #define GCOV_TAG_LINES ((gcov_unsigned_t)0x01450000) #define GCOV_TAG_COUNTER_BASE ((gcov_unsigned_t)0x01a10000) #define GCOV_TAG_COUNTER_LENGTH(NUM) ((NUM) * 2) #define GCOV_TAG_COUNTER_NUM(LENGTH) ((LENGTH) / 2) #define GCOV_TAG_OBJECT_SUMMARY ((gcov_unsigned_t)0xa1000000) #define GCOV_TAG_PROGRAM_SUMMARY ((gcov_unsigned_t)0xa3000000) #define GCOV_TAG_SUMMARY_LENGTH \ (1 + GCOV_COUNTERS_SUMMABLE * (2 + 3 * 2)) /* Counters that are collected. */ #define GCOV_COUNTER_ARCS 0 /* Arc transitions. */ #define GCOV_COUNTERS_SUMMABLE 1 /* Counters which can be summaried. */ #define GCOV_FIRST_VALUE_COUNTER 1 /* The first of counters used for value profiling. They must form a consecutive interval and their order must match the order of HIST_TYPEs in value-prof.h. */ #define GCOV_COUNTER_V_INTERVAL 1 /* Histogram of value inside an interval. */ #define GCOV_COUNTER_V_POW2 2 /* Histogram of exact power2 logarithm of a value. */ #define GCOV_COUNTER_V_SINGLE 3 /* The most common value of expression. */ #define GCOV_COUNTER_V_DELTA 4 /* The most common difference between consecutive values of expression. */ #define GCOV_LAST_VALUE_COUNTER 4 /* The last of counters used for value profiling. */ #define GCOV_COUNTERS 5 /* Number of counters used for value profiling. */ #define GCOV_N_VALUE_COUNTERS \ (GCOV_LAST_VALUE_COUNTER - GCOV_FIRST_VALUE_COUNTER + 1) /* A list of human readable names of the counters */ #define GCOV_COUNTER_NAMES {"arcs", "interval", "pow2", "single", "delta"} /* Names of merge functions for counters. */ #define GCOV_MERGE_FUNCTIONS {"__gcov_merge_add", \ "__gcov_merge_add", \ "__gcov_merge_add", \ "__gcov_merge_single", \ "__gcov_merge_delta"} /* Convert a counter index to a tag. */ #define GCOV_TAG_FOR_COUNTER(COUNT) \ (GCOV_TAG_COUNTER_BASE + ((gcov_unsigned_t)(COUNT) << 17)) /* Convert a tag to a counter. */ #define GCOV_COUNTER_FOR_TAG(TAG) \ ((unsigned)(((TAG) - GCOV_TAG_COUNTER_BASE) >> 17)) /* Check whether a tag is a counter tag. */ #define GCOV_TAG_IS_COUNTER(TAG) \ (!((TAG) & 0xFFFF) && GCOV_COUNTER_FOR_TAG (TAG) < GCOV_COUNTERS) /* The tag level mask has 1's in the position of the inner levels, & the lsb of the current level, and zero on the current and outer levels. */ #define GCOV_TAG_MASK(TAG) (((TAG) - 1) ^ (TAG)) /* Return nonzero if SUB is an immediate subtag of TAG. */ #define GCOV_TAG_IS_SUBTAG(TAG,SUB) \ (GCOV_TAG_MASK (TAG) >> 8 == GCOV_TAG_MASK (SUB) \ && !(((SUB) ^ (TAG)) & ~GCOV_TAG_MASK(TAG))) /* Return nonzero if SUB is at a sublevel to TAG. */ #define GCOV_TAG_IS_SUBLEVEL(TAG,SUB) \ (GCOV_TAG_MASK (TAG) > GCOV_TAG_MASK (SUB)) /* Basic block flags. */ #define GCOV_BLOCK_UNEXPECTED (1 << 1) /* Arc flags. */ #define GCOV_ARC_ON_TREE (1 << 0) #define GCOV_ARC_FAKE (1 << 1) #define GCOV_ARC_FALLTHROUGH (1 << 2) /* Structured records. */ /* Cumulative counter data. */ struct gcov_ctr_summary { gcov_unsigned_t num; /* number of counters. */ gcov_unsigned_t runs; /* number of program runs */ gcov_type sum_all; /* sum of all counters accumulated. */ gcov_type run_max; /* maximum value on a single run. */ gcov_type sum_max; /* sum of individual run max values. */ }; /* Object & program summary record. */ struct gcov_summary { gcov_unsigned_t checksum; /* checksum of program */ struct gcov_ctr_summary ctrs[GCOV_COUNTERS_SUMMABLE]; }; /* Structures embedded in coveraged program. The structures generated by write_profile must match these. */ #if IN_LIBGCOV /* Information about a single function. This uses the trailing array idiom. The number of counters is determined from the counter_mask in gcov_info. We hold an array of function info, so have to explicitly calculate the correct array stride. */ struct gcov_fn_info { gcov_unsigned_t ident; /* unique ident of function */ gcov_unsigned_t checksum; /* function checksum */ unsigned n_ctrs[0]; /* instrumented counters */ }; /* Type of function used to merge counters. */ typedef void (*gcov_merge_fn) (gcov_type *, gcov_unsigned_t); /* Information about counters. */ struct gcov_ctr_info { gcov_unsigned_t num; /* number of counters. */ gcov_type *values; /* their values. */ gcov_merge_fn merge; /* The function used to merge them. */ }; /* Information about a single object file. */ struct gcov_info { gcov_unsigned_t version; /* expected version number */ struct gcov_info *next; /* link to next, used by libgcov */ gcov_unsigned_t stamp; /* uniquifying time stamp */ const char *filename; /* output file name */ unsigned n_functions; /* number of functions */ const struct gcov_fn_info *functions; /* table of functions */ unsigned ctr_mask; /* mask of counters instrumented. */ struct gcov_ctr_info counts[0]; /* count data. The number of bits set in the ctr_mask field determines how big this array is. */ }; /* Register a new object file module. */ extern void __gcov_init (struct gcov_info *) ATTRIBUTE_HIDDEN; /* Called before fork, to avoid double counting. */ extern void __gcov_flush (void) ATTRIBUTE_HIDDEN; /* The merge function that just sums the counters. */ extern void __gcov_merge_add (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; /* The merge function to choose the most common value. */ extern void __gcov_merge_single (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; /* The merge function to choose the most common difference between consecutive values. */ extern void __gcov_merge_delta (gcov_type *, unsigned) ATTRIBUTE_HIDDEN; /* The profiler functions. */ extern void __gcov_interval_profiler (gcov_type *, gcov_type, int, unsigned); extern void __gcov_pow2_profiler (gcov_type *, gcov_type); extern void __gcov_one_value_profiler (gcov_type *, gcov_type); #ifndef inhibit_libc /* The wrappers around some library functions.. */ extern pid_t __gcov_fork (void); extern int __gcov_execl (const char *, const char *, ...) ATTRIBUTE_HIDDEN; extern int __gcov_execlp (const char *, const char *, ...) ATTRIBUTE_HIDDEN; extern int __gcov_execle (const char *, const char *, ...) ATTRIBUTE_HIDDEN; extern int __gcov_execv (const char *, char *const []) ATTRIBUTE_HIDDEN; extern int __gcov_execvp (const char *, char *const []) ATTRIBUTE_HIDDEN; extern int __gcov_execve (const char *, char *const [], char *const []) ATTRIBUTE_HIDDEN; #endif #endif /* IN_LIBGCOV */ #if IN_LIBGCOV >= 0 /* Optimum number of gcov_unsigned_t's read from or written to disk. */ #define GCOV_BLOCK_SIZE (1 << 10) GCOV_LINKAGE struct gcov_var { FILE *file; gcov_position_t start; /* Position of first byte of block */ unsigned offset; /* Read/write position within the block. */ unsigned length; /* Read limit in the block. */ unsigned overread; /* Number of words overread. */ int error; /* < 0 overflow, > 0 disk error. */ int mode; /* < 0 writing, > 0 reading */ #if IN_LIBGCOV /* Holds one block plus 4 bytes, thus all coverage reads & writes fit within this buffer and we always can transfer GCOV_BLOCK_SIZE to and from the disk. libgcov never backtracks and only writes 4 or 8 byte objects. */ gcov_unsigned_t buffer[GCOV_BLOCK_SIZE + 1]; #else int endian; /* Swap endianness. */ /* Holds a variable length block, as the compiler can write strings and needs to backtrack. */ size_t alloc; gcov_unsigned_t *buffer; #endif } gcov_var ATTRIBUTE_HIDDEN; /* Functions for reading and writing gcov files. In libgcov you can open the file for reading then writing. Elsewhere you can open the file either for reading or for writing. When reading a file you may use the gcov_read_* functions, gcov_sync, gcov_position, & gcov_error. When writing a file you may use the gcov_write functions, gcov_seek & gcov_error. When a file is to be rewritten you use the functions for reading, then gcov_rewrite then the functions for writing. Your file may become corrupted if you break these invariants. */ #if IN_LIBGCOV GCOV_LINKAGE int gcov_open (const char */*name*/) ATTRIBUTE_HIDDEN; #else GCOV_LINKAGE int gcov_open (const char */*name*/, int /*direction*/); GCOV_LINKAGE int gcov_magic (gcov_unsigned_t, gcov_unsigned_t); #endif GCOV_LINKAGE int gcov_close (void) ATTRIBUTE_HIDDEN; /* Available everywhere. */ static gcov_position_t gcov_position (void); static int gcov_is_error (void); GCOV_LINKAGE gcov_unsigned_t gcov_read_unsigned (void) ATTRIBUTE_HIDDEN; GCOV_LINKAGE gcov_type gcov_read_counter (void) ATTRIBUTE_HIDDEN; GCOV_LINKAGE void gcov_read_summary (struct gcov_summary *) ATTRIBUTE_HIDDEN; #if IN_LIBGCOV /* Available only in libgcov */ GCOV_LINKAGE void gcov_write_counter (gcov_type) ATTRIBUTE_HIDDEN; GCOV_LINKAGE void gcov_write_tag_length (gcov_unsigned_t, gcov_unsigned_t) ATTRIBUTE_HIDDEN; GCOV_LINKAGE void gcov_write_summary (gcov_unsigned_t /*tag*/, const struct gcov_summary *) ATTRIBUTE_HIDDEN; static void gcov_rewrite (void); GCOV_LINKAGE void gcov_seek (gcov_position_t /*position*/) ATTRIBUTE_HIDDEN; #else /* Available outside libgcov */ GCOV_LINKAGE const char *gcov_read_string (void); GCOV_LINKAGE void gcov_sync (gcov_position_t /*base*/, gcov_unsigned_t /*length */); #endif #if !IN_GCOV /* Available outside gcov */ GCOV_LINKAGE void gcov_write_unsigned (gcov_unsigned_t) ATTRIBUTE_HIDDEN; #endif #if !IN_GCOV && !IN_LIBGCOV /* Available only in compiler */ GCOV_LINKAGE void gcov_write_string (const char *); GCOV_LINKAGE gcov_position_t gcov_write_tag (gcov_unsigned_t); GCOV_LINKAGE void gcov_write_length (gcov_position_t /*position*/); #endif #if IN_GCOV > 0 /* Available in gcov */ GCOV_LINKAGE time_t gcov_time (void); #endif /* Save the current position in the gcov file. */ static inline gcov_position_t gcov_position (void) { gcc_assert (gcov_var.mode > 0); return gcov_var.start + gcov_var.offset; } /* Return nonzero if the error flag is set. */ static inline int gcov_is_error (void) { return gcov_var.file ? gcov_var.error : 1; } #if IN_LIBGCOV /* Move to beginning of file and initialize for writing. */ static inline void gcov_rewrite (void) { gcc_assert (gcov_var.mode > 0); gcov_var.mode = -1; gcov_var.start = 0; gcov_var.offset = 0; fseek (gcov_var.file, 0L, SEEK_SET); } #endif #endif /* IN_LIBGCOV >= 0 */ #endif /* GCC_GCOV_IO_H */
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